package Exerise;public class Cexercise {
    public static void main1(String[] args) {
        System.out.println("结果是：" +100/17*17);
    }

    public int romanToInt(String s) {
        int sum =0;
        int preNum = getVaule(s.charAt(0));
        for (int i =1;i<s.length();i++){
            int num = getVaule(s.charAt(i));
            if(preNum<num){
                sum-=preNum;
            }else{
                sum+=preNum;
            }
            preNum=num;
        }
        sum+=preNum;
        return sum;
    }
    private int getVaule(char n){
        switch(n){
            case 'I' :return 1;
            case 'V': return 5;
            case 'X':return 10;
            case 'L': return 50;
            case 'C' :return 100;
            case 'D': return 500;
            case 'M': return 1000;
            default: return 0;
        }
    }
}
